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        <h1>Mount volume to a docker container running in a docker container</h1>
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          <i class="fa fa-calendar" aria-hidden="true"></i>
          <time>2019年05月05日</time>
          
          | <i class="fa fa-folder-open-o" aria-hidden="true"></i> 
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  <a href="/tags/#docker" class='tag'>docker</a>


          
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        <h1 id="一个匪夷所思的需求"><a href="#一个匪夷所思的需求" class="headerlink" title="一个匪夷所思的需求"></a>一个匪夷所思的需求</h1><p>有时候我们需要在 docker container 里面运行一个 docker container（虽然都是运行在宿主机的 docker daemon 里的），这个其实使用 <code>-v /var/run/docker.sock:/var/run/docker.sock</code> 就能做到了。本文的重点是下面这种情况：</p>
<p><img src="1.png" alt=""></p>
<p>也就是说，我们想让最里层的 container 2 和中间的 container 都能够访问宿主机上的一个目录。</p>
<h1 id="在-linux-下的实现方法"><a href="#在-linux-下的实现方法" class="headerlink" title="在 linux 下的实现方法"></a>在 linux 下的实现方法</h1><p>这个其实非常简单，只需要在运行 docker 的时候使用宿主机的目录即可：<br><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">~ <span class="comment"># docker run -it --rm -v ~/your-path/:/a -v /var/run/docker.sock:/var/run/docker.sock docker</span></span><br><span class="line">/ <span class="comment"># ls /a</span></span><br><span class="line">color.Dockerfile        makefile                test.Dockerfile         testArgPath.Dockerfile</span><br><span class="line">/ <span class="comment"># docker run -it --rm -v ~/your-path/:/b -v /var/run/docker.sock:/var/run/docker.sock docker</span></span><br><span class="line">/ <span class="comment"># ls /a</span></span><br><span class="line">ls: /a: No such file or directory</span><br><span class="line">/ <span class="comment"># ls /b</span></span><br><span class="line">color.Dockerfile        makefile                test.Dockerfile         testArgPath.Dockerfile</span><br></pre></td></tr></table></figure></p>
<p>由于在 container 1 中调用 docker cli 是直接访问的宿主机的 docker daemon，因此可以挂载宿主机上的任意一个路径。这里要注意的是，即使是在 container 1 中运行的 docker cli，在使用 -v 挂载路径的时候指定的也是宿主机里的路径，而不是 container 中的路径。</p>
<h1 id="在-windows-下的实现方法"><a href="#在-windows-下的实现方法" class="headerlink" title="在 windows 下的实现方法"></a>在 windows 下的实现方法</h1><p>(我只在 docker-desktop (linux 容器) 里实验过，不保证在其他版本里也能用。)</p>
<p>由于 container 1 中只能接收 linux 格式的路径，只需要把类似于 <code>d:/Sources</code> 这样的格式换成 <code>/d/Sources</code> 即可：</p>
<p><img src="2.png" alt=""></p>

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        <ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link" href="#一个匪夷所思的需求"><span class="toc-number">1.</span> <span class="toc-text">一个匪夷所思的需求</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#在-linux-下的实现方法"><span class="toc-number">2.</span> <span class="toc-text">在 linux 下的实现方法</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#在-windows-下的实现方法"><span class="toc-number">3.</span> <span class="toc-text">在 windows 下的实现方法</span></a></li></ol>
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